adorn vs ornament

adorn is not a noun while ornament is a noun.

Word	Noun	Adjective	Verb	Adverb
adorn	No	No	Yes	No
ornament	Yes	No	Yes	No

As verbs, adorn and ornament are synonyms defined as:

adorn and ornament: make more attractive by adding ornament, colour, etc.

Other synonyms of adorn include beautify, decorate, embellish, grace.

As verbs, ornament is a hyponym of adorn; that is, ornament is a word with a more specific, narrower meaning than adorn:

adorn (noun)	ornament (noun)
	something used to beautify

adorn (verb)	ornament (verb)
make more attractive by adding ornament, colour, etc.	make more attractive by adding ornament, colour, etc.
furnish with power or authority; of kings or emperors	be an ornament to
be beautiful to look at